Re: AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187) (Matthew Reynolds )

Subject: Re: AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187) From: Matthew Reynolds <Matthew.Reynolds@xxxxxxxx> Date: Wed, 19 Aug 2009 08:17:05 +0100 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY> --MCBoundary=_109081908170803001 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Ranjit, Its not clear from your description exactly what you mean by the positive half of he sinusoid period is larger. If by this you just mean it is a pure 100Hz tone with a larger amplitude above the x-axis then in effect what you have created is 100Hz tone with DC applied, so your FFT could be correct. Depending on how you've made the positive half of the cycle bigger, the tone will have been distorted slightly so other frequencies may be present but chances are these distortions are small and they could be lost in the FFT due to windowing etc. The flutter you are hearing could just be down to your setup, particularly the loudspeaker you are using, reacting badly to the DC component. DC will mean the point of zero amplitude of the sinusoid will not be natural resting place of the loudspeaker, so as the drive unit moves backwards with the negative half of the sinusoid period, at first the loudspeaker suspension is working with the drive coil, and then as the loudspeaker cone travels through its mid point suddenly the suspension is working against the drive unit. While I have never experienced it personally, this could mean you see some interesting effects, one of which may be 'flutter'. Matt -----Original Message----- From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx On Behalf Of AUDITORY automatic digest system Sent: 19 August 2009 05:06 To: AUDITORY@xxxxxxxx Subject: AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187) There are 4 messages totalling 573 lines in this issue. Topics of the day: 1. lopsided tones. (2) 2. Call for Participation - SBCM 2009 3. DSP Research Engineer Position Available ---------------------------------------------------------------------- Date: Mon, 17 Aug 2009 15:41:39 -0400 From: Ranjit Randhawa <rsran@xxxxxxxx> Subject: lopsided tones. Dear List, I have been experimenting with a 100hz tone, where the positive half=20 sinusoid of the period is larger than the negative, the phase is however is not changed. Speech seems to have this profile of larger positive=20 pulses as compared to the negative, hence my interest. Applying fft to=20 such a signal, I get an increase in magnitude for the 100hz component,=20 and an increase in the dc component. What I hear however is the basic=20 100hz tone, and a flutter on top of it, not what fft seems to indicate.=20 My assumption was that the increased dc component would not be heard,=20 and I would hear an increase in loudness of the 100 hz. However, the=20 base 100hz loudness does not seem to change as I increase the area under the positive sinusoid, but the flutter does. Any history or explanation=20 would be most welcome. Thanks and regards, Randy Randhawa ------------------------------ Date: Tue, 18 Aug 2009 10:09:13 -0300 From: "Regis Rossi A. Faria" <regis@xxxxxxxx> Subject: Call for Participation - SBCM 2009 (Please apologize for cross-postings) CALL FOR PARTICIPATION SBCM 2009 The 12th Brazilian Symposium on Computer Music XII Simp=3DF3sio Brasileiro de Computa=3DE7=3DE3o Musical http://compmus.ime.usp.br/sbcm/2009 Recife, Brazil, September 7-9, 2009 This year's SBCM will be held in the beautiful city of Recife, on the=3D20 northeastern Brazilian coast, featuring high-level technical and musical sessions,=3D20 keynote talks by world-renowned guests, and concerts. The program includes: - Technical Papers - Music Papers - Posters presentations - Invited Talk by Miller Puckette (CRCA/UCSD, USA) - Invited Talk by Daniel Teruggi (INA/GRM, France) - Workshops - Concerts REGISTRATION =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D Discounted registration fees are available until August 21st (Friday). For online registration, visit http://compmus.ime.usp.br/sbcm/2009/english/registration.html (for Brazilians:=3D20 http://compmus.ime.usp.br/sbcm/2009/portugues/inscricao.html). PROGRAM =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D The program will include 10 Technical Papers, 5 Music Papers, 9 posters, 3 concerts, 2 panels, 2 invited talks, and a workshop (tutorial). The topics of the technical sessions will cover: * Acoustics, Diffusion, Sonorization * Artificial Life and Evolutionary Music Systems * Audio Digital Signal Processing * Computer-Aided Music Analysis * Computer-Aided Musicology * Internet and Web Applications * Movement and Gesture * Multimedia Systems and Applications * Music Information Retrieval * Psychoacoustics and Cognitive Modeling * Real-time Interactive Systems * Software Systems and Languages for Composition * Sound Synthesis FURTHER INFORMATION =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D Participants flying GOL Airlines from anywhere in Latin America to Recife get 20% off on the purchase of the tickets. For further information, including the list of accepted papers, please visit the symposium home page at http://compmus.ime.usp.br/sbcm/2009. For questions about registration, local organization and other inquiries,=3D please contact the chairs at sbcm2009@xxxxxxxx --=3D20 Regis Rossi Alves Faria regis@xxxxxxxx LSI - Laboratory of Integrable Systems - University of Sao Paulo Audio Engineering and Coding Center 05508-010 S=3DE3o Paulo - Brazil phone: +55 11 3091 5589 Organia Musical Engineering |Audiovisual Technologies www.organia.com.br S=3DE3o Paulo - Brazil phone: +55 11 3070 9646 ------------------------------ Date: Tue, 18 Aug 2009 11:44:18 -0500 From: christopher jette <christopherjette@xxxxxxxx> Subject: Re: lopsided tones. --00504502c070c4ec3104716d3ad4 Content-Type: text/plain; charset=3DISO-8859-1 Content-Transfer-Encoding: 7bit One question of clarification. When you say the positive period of the waveform is larger, I assume you mean that you are employing a longer wave period (read: linear distance in a waveform display), as opposed to vertical distance from the zero crossing, in comparison with the negative section. Is that correct. If the wave period is longer, you are creating a period that is of a different length and therefore not 100Hz, but a slightly different frequency. My understanding is that he two tones are interfering, hence the flutter (sidebands both above and below the 100Hz tone). Cheers~ Christopher On Mon, Aug 17, 2009 at 2:41 PM, Ranjit Randhawa <rsran@xxxxxxxx> wrote: > Dear List, > I have been experimenting with a 100hz tone, where the positive half > sinusoid of the period is larger than the negative, the phase is however is > not changed. Speech seems to have this profile of larger positive pulses as > compared to the negative, hence my interest. Applying fft to such a signal, > I get an increase in magnitude for the 100hz component, and an increase in > the dc component. What I hear however is the basic 100hz tone, and a flutter > on top of it, not what fft seems to indicate. My assumption was that the > increased dc component would not be heard, and I would hear an increase in > loudness of the 100 hz. However, the base 100hz loudness does not seem to > change as I increase the area under the positive sinusoid, but the flutter > does. Any history or explanation would be most welcome. > Thanks and regards, > Randy Randhawa > --=20 www.cj.lovelyweather.com christopherjette@xxxxxxxx 617.869.3968 --00504502c070c4ec3104716d3ad4 Content-Type: text/html; charset=3DISO-8859-1 Content-Transfer-Encoding: quoted-printable One question of clarification. When you say the positive period of the wave=3D form is larger, I assume you mean that you are employing a longer wave peri=3D od (read: linear distance in a waveform display), as opposed to vertical di=3D stance from the zero crossing, in comparison with the negative section.=3DA0 =3D Is that correct. If the wave period is longer, you are creating a period that is of a di=3D fferent length and therefore not 100Hz, but a slightly different frequency.=3D My understanding is that he two tones are interfering, hence the flutter (=3D sidebands both above and below the 100Hz tone). Cheers~ Christopher <div class=3D3D"gmail_quote">On Mon, Aug 17=3D , 2009 at 2:41 PM, Ranjit Randhawa <<a href=3D3D"mailto:=3D rsran@xxxxxxxx">rsran@xxxxxxxx</a>> wrote: <blockquote c=3D lass=3D3D"gmail_quote" style=3D3D"border-left: 1px solid rgb(204, 204, 204)= ; ma=3D rgin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Dear List, I have been experimenting with a 100hz tone, where the positive half sinuso=3D id of the period is larger than the negative, the phase is however is not c=3D hanged. Speech seems to have this profile of larger positive pulses as comp=3D ared to the negative, hence my interest. Applying fft to such a signal, I g=3D et an increase in magnitude for the 100hz component, and an increase in the=3D dc component. What I hear however is the basic 100hz tone, and a flutter o=3D n top of it, not what fft seems to indicate. My assumption was that the inc=3D reased dc component would not be heard, and I would hear an increase in lou=3D dness of the 100 hz. However, the base 100hz loudness does not seem to chan=3D ge as I increase the area under the positive sinusoid, but the flutter does=3D . Any history or explanation would be most welcome. Thanks and regards, Randy Randhawa </blockquote></div> -- <a href=3D3D"http://www.c=3D j.lovelyweather.com">www.cj.lovelyweather.com</a> <a href=3D3D"mailto:chri=3D stopherjette@xxxxxxxx">christopherjette@xxxxxxxx</a> 617.869.3968 --00504502c070c4ec3104716d3ad4-- ------------------------------ Date: Tue, 18 Aug 2009 15:28:59 -0500 From: Tao Zhang <Tao_Zhang@xxxxxxxx> Subject: DSP Research Engineer Position Available --_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_ Content-Type: text/plain; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable Starkey Laboratories, Inc., an equal opportunity employer and a recognized =3D world leader in providing the highest quality hearing technology available, has an exciting opportunity for a full-time DSP resea=3D rch engineer at its international headquarters located in Minnesota, USA. This position is responsible for research and development o=3D f signal processing algorithms for hearing aids. Qualifications A Ph.D. degree or equivalent in electrical engineering, computer science or=3D related field is required. Candidates with a Master's degree in electrical engineering, computer science or related field and 3+ =3D years of applicable experience may be considered. Research experience in hearing aids or cochlear implants is highly desirable. Resear=3D ch experience in audio signal processing algorithms, psychoacoustics or acoustics is a plus. Skills * Proficiency in Matlab is required * Proficiency in C, C++ or C# is required * Good verbal and written communication skills are required * Good interpersonal skills are required * Advanced knowledge of digital signal processing is required * Technical leadership in a research project is highly desirable * Proficiency in statistical analysis is desirable * Familiarity with typical hearing aid algorithms, such as multiple-chan=3D nel compression, speech enhancement, microphone array processing, learning algorithms and audio classification algorithms i=3D s a plus Salary Salary will be commensurate with experience. Benefits Visa Sponsorship, 401k, Employee Stock Ownership Plan, Profit Sharing, Heal=3D th Insurance, and Tuition Reimbursement Contact Potential candidates should send a cover letter and a CV to Mr. Tony Tran u=3D sing the following information Tony Tran Human Resources Starkey Laboratories, Inc. 6600 Washington Ave. S. Eden Prairie, MN 55344 Tel: (952)828-6924 Email: tony_tran@xxxxxxxx<mailto:tony_tran@xxxxxxxx> Web: www.starkey.com/careers<http://www.starkey.com/careers> --_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_ Content-Type: text/html; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D3D"urn:schemas-microsoft-com:vml" xmlns:o=3D3D"urn:schemas-micr=3D osoft-com:office:office" xmlns:w=3D3D"urn:schemas-microsoft-com:office:word" =3D xmlns:m=3D3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D3D"http:=3D //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D3DContent-Type content=3D3D"text/html; charset=3D3Dus-ascii"> <meta name=3D3DGenerator content=3D3D"Microsoft Word 12 (filtered medium)"> <style>  </style>  </head> <body lang=3D3DEN-US link=3D3Dblue vlink=3D3Dpurple> <div class=3D3DSection1> Starkey Laboratories= , In=3D c., an equal opportunity employer and a recognized world leader in providing the highest quality hearing <o:p></o:p> technology available= , ha=3D s an exciting opportunity for a full-time DSP research engineer at its internati=3D onal headquarters located in <o:p></o:p> Minnesota, USA. This pos=3D ition is responsible for research and development of signal processing algorithms fo=3D r hearing aids. <o:p></o:p> <o:p> </o:p>=3D Qualifications<o:p></=3D o:p> A Ph.D. degree or equiva=3D lent in electrical engineering, computer science or related field is required. Candidates with a Master’s <o:p></o:p> degree in electrical engineering, computer science or related field and 3+ years of applicable experience may be considered. Research <o:p></o:p> experience in hearin= g ai=3D ds or cochlear implants is highly desirable. Research experience in audio signal processing algorithms, <o:p></o:p> psychoacoustics or acous=3D tics is a plus.<o:p></o:p> <o:p> </o:p></p= > Skills <o:p></o:p></b=3D> <ul style=3D3D'margin-top:0in' type=3D3Ddisc> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Proficiency in Matlab is required<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Proficiency in C, C++ or C# is required<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Good verbal and written communication skills are required<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Good interpersonal skills are required<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Advanced knowledge of digital signal processing is required<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Technical leadership in a research project is highly desirable<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Proficiency in statistical analysis is desirable<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Familiarity with typical hearing aid algorithms, such as multiple-channel compress=3D ion, speech enhancement, microphone <o:p></o:p></li> </ul> array processing, learning algorithms and audio classification algorithms is a pl=3D us<o:p></o:p> <o:p> </o:p>=3D Salary<o:p></o:p>=3D Salary will be commensur=3D ate with experience. <o:p></o:p> <o:p> </o:p></p= > Benefits <o:p></o=3D :p> Visa Sponsorship, 401k, =3D Employee Stock Ownership Plan, Profit Sharing, Health Insurance, and Tuition Reimbursement<o:p></o:p> <o:p> </o:p> Contact<o:p></o:p> Potential candidates should send a cover letter and a CV to Mr. Tony Tran using the following information<o:p></o:p>          &=3D nbsp;  Tony Tran<o:p></o:p>          &=3D nbsp;  Human Resources<o:p></o:p>          &=3D nbsp;  Starkey Laboratories, Inc.<o:p></o:p>          &=3D nbsp;  6600 Washington Ave. S.<o:p></o:p>          &=3D nbsp;  Eden Prairie, MN 55344<o:p></o:p>          &=3D nbsp;  Tel: (952)828-6924<o:p></o:p>          &=3D nbsp;  Email: <a href=3D3D"mailto:tony_tran@xxxxxxxx">tony_tran@xxxxxxxx</a><o:p></o: =3D p>          &=3D nbsp;  Web: <a href=3D3D"http://www.starkey.com/careers">www.starkey.com/careers</a><o:p> =3D </o:p> <o:p> </o:p> </li></ul></div> </body> </html> --_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_-- ------------------------------ End of AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187) *************************************************************** The information in this email is confidential. It is intended solely for the addressee. Access to this email by anyone else is unauthorised. If you are not the intended recipient, any disclosure, copying, or distribution is prohibited and may be unlawful. If you have received this email in error please delete it immediately and contact commercial@xxxxxxxx Sepura plc. Registered Office: Radio House, St Andrew=92s Road, Cambridge, = CB4 1GR, England. Registered in England and Wales. Registration Number 4353= 801 =20 --MCBoundary=_109081908170803001 Content-Type: text/html; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable <HTML><BODY> Ranjit, Its not clear from your description exactly what you mean by the positive half of he sinusoid period is larger. If by this you just mean it is a pure 100Hz tone with a larger amplitude above the x-axis then in<BR= > effect what you have created is 100Hz tone with DC applied, so your FFT could be correct. Depending on how you've made the positive half of the cycle bigger, the tone will have been distorted slightly so other frequencies may be present but chances are these distortions are small and they could be lost in the FFT due to windowing etc. The flutter you are hearing could just be down to your setup, particularly the loudspeaker you are using, reacting badly to the DC component. DC will mean the point of zero amplitude of the sinusoid will<BR= > not be natural resting place of the loudspeaker, so as the drive unit moves backwards with the negative half of the sinusoid period, at first the loudspeaker suspension is working with the drive coil, and then as the loudspeaker cone travels through its mid point suddenly the suspension is working against the drive unit. While I have never experienced it personally, this could mean you see some interesting effects, one of which may be 'flutter'. Matt -----Original Message----- From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx On Behalf Of AUDITORY automatic digest<BR= > system Sent: 19 August 2009 05:06 To: <a href=3D"mailto:AUDITORY@xxxxxxxx">AUDITORY@xxxxxxxx</a= > Subject: AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187) There are 4 messages totalling 573 lines in this issue. Topics of the day: 1. lopsided tones. (2) 2. Call for Participation - SBCM 2009 3. DSP Research Engineer Position Available ---------------------------------------------------------------------- Date: Mon, 17 Aug 2009 15:41:39 -0400 From: Ranjit Randhawa <<a href=3D"mailto:rsran@xxxxxxxx">rsran@xxxxxxxx= IZON.NET</a>> Subject: lopsided tones. Dear List, I have been experimenting with a 100hz tone, where the positive half sinusoid of the period is larger than the negative, the phase is however<BR= > is not changed. Speech seems to have this profile of larger positive pulses as compared to the negative, hence my interest. Applying fft to such a signal, I get an increase in magnitude for the 100hz component, and an increase in the dc component. What I hear however is the basic 100hz tone, and a flutter on top of it, not what fft seems to indicate. <BR= > My assumption was that the increased dc component would not be heard, and I would hear an increase in loudness of the 100 hz. However, the base 100hz loudness does not seem to change as I increase the area under<BR= > the positive sinusoid, but the flutter does. Any history or explanation <BR= > would be most welcome. Thanks and regards, Randy Randhawa ------------------------------ Date: Tue, 18 Aug 2009 10:09:13 -0300 From: "Regis Rossi A. Faria" <<a href=3D"mailto:regis@xxxxxxxx= SP.BR">regis@xxxxxxxx</a>> Subject: Call for Participation - SBCM 2009 (Please apologize for cross-postings) CALL FOR PARTICIPATION SBCM 2009 The 12th Brazilian Symposium on Computer Music XII Simp=3DF3sio Brasileiro de Computa=3DE7=3DE3o Musical <a href=3D"http://compmus.ime.usp.br/sbcm/2009" target=3D"_bl= ank">http://compmus.ime.usp.br/sbcm/2009</a> Recife, Brazil, September 7-9, 2009 This year's SBCM will be held in the beautiful city of Recife, on the=3D20<= BR> northeastern Brazilian coast, featuring high-level technical and musical sessions,=3D20<= BR> keynote talks by world-renowned guests, and concerts. The program includes: - Technical Papers - Music Papers - Posters presentations - Invited Talk by Miller Puckette (CRCA/UCSD, USA) - Invited Talk by Daniel Teruggi (INA/GRM, France) - Workshops - Concerts REGISTRATION =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D Discounted registration fees are available until August 21st (Friday). For online registration, visit <a href=3D"http://compmus.ime.usp.br/sbcm/2009/english/registration.html" t= arget=3D"_blank">http://compmus.ime.usp.br/sbcm/2009/english/registration.h= tml</a> (for Brazilians:=3D20 <a href=3D"http://compmus.ime.usp.br/sbcm/2009/portugues/inscricao.html)." = target=3D"_blank">http://compmus.ime.usp.br/sbcm/2009/portugues/inscricao.h= tml).</a> PROGRAM =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D The program will include 10 Technical Papers, 5 Music Papers, 9 posters,<BR= > 3 concerts, 2 panels, 2 invited talks, and a workshop (tutorial). The topics of the technical sessions will cover: * Acoustics, Diffusion, Sonorization * Artificial Life and Evolutionary Music Systems * Audio Digital Signal Processing * Computer-Aided Music Analysis * Computer-Aided Musicology * Internet and Web Applications * Movement and Gesture * Multimedia Systems and Applications * Music Information Retrieval * Psychoacoustics and Cognitive Modeling * Real-time Interactive Systems * Software Systems and Languages for Composition * Sound Synthesis FURTHER INFORMATION =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D Participants flying GOL Airlines from anywhere in Latin America to Recife get 20% off on the purchase of the tickets. For further information, including the list of accepted papers, please visit the symposium home page at <a href=3D"http://compmus.ime.usp.br/sbcm/2009." tar= get=3D"_blank">http://compmus.ime.usp.br/sbcm/2009.</a> For questions about registration, local organization and other inquiries,=3D please contact the chairs at <a href=3D"mailto:sbcm2009@xxxxxxxx">sbcm200= 9@xxxxxxxx</a> --=3D20 Regis Rossi Alves Faria <a href=3D"mailto:regis@xxxxxxxx">regis@xxxxxxxx</a> LSI - Laboratory of Integrable Systems - University of Sao Paulo Audio Engineering and Coding Center 05508-010 S=3DE3o Paulo - Brazil phone: +55 11 3091 5589 Organia Musical Engineering |Audiovisual Technologies <a href=3D"http://www.organia.com.br" target=3D"_blank">www.organia.com.br<= /a> S=3DE3o Paulo - Brazil phone: +55 11 3070 9646 ------------------------------ Date: Tue, 18 Aug 2009 11:44:18 -0500 From: christopher jette <<a href=3D"mailto:christopherjette@xxxxxxxx= ">christopherjette@xxxxxxxx</a>> Subject: Re: lopsided tones. --00504502c070c4ec3104716d3ad4 Content-Type: text/plain; charset=3DISO-8859-1 Content-Transfer-Encoding: 7bit One question of clarification. When you say the positive period of the waveform is larger, I assume you mean that you are employing a longer wave period (read: linear distance in a waveform display), as opposed to vertical distance from the zero crossing, in comparison with the negative section. Is that correct. If the wave period is longer, you are creating a period that is of a different length and therefore not 100Hz, but a slightly different frequency. My understanding is that he two tones are interfering, hence the flutter (sidebands both above and below the 100Hz tone). Cheers~ Christopher On Mon, Aug 17, 2009 at 2:41 PM, Ranjit Randhawa <<a href=3D"mailto:rsra= n@xxxxxxxx">rsran@xxxxxxxx</a>> wrote: > Dear List, > I have been experimenting with a 100hz tone, where the positive half<B= R> > sinusoid of the period is larger than the negative, the phase is however is > not changed. Speech seems to have this profile of larger positive pulses as > compared to the negative, hence my interest. Applying fft to such a<BR= > signal, > I get an increase in magnitude for the 100hz component, and an increase in > the dc component. What I hear however is the basic 100hz tone, and a<B= R> flutter > on top of it, not what fft seems to indicate. My assumption was that<B= R> the > increased dc component would not be heard, and I would hear an increase in > loudness of the 100 hz. However, the base 100hz loudness does not seem= to > change as I increase the area under the positive sinusoid, but the flutter > does. Any history or explanation would be most welcome. > Thanks and regards, > Randy Randhawa > -- <a href=3D"http://www.cj.lovelyweather.com" target=3D"_blank">www.cj.lovely= weather.com</a> <a href=3D"mailto:christopherjette@xxxxxxxx">christopherjette@xxxxxxxx</a= > 617.869.3968 --00504502c070c4ec3104716d3ad4 Content-Type: text/html; charset=3DISO-8859-1 Content-Transfer-Encoding: quoted-printable One question of clarification. When you say the positive period of the wave=3D form is larger, I assume you mean that you are employing a longer wave peri=3D od (read: linear distance in a waveform display), as opposed to vertical<BR= > di=3D stance from the zero crossing, in comparison with the negative section.=3DA0 =3D Is that correct. If the wave period is longer, you are creating a period that is o= f a di=3D fferent length and therefore not 100Hz, but a slightly different frequency.=3D My understanding is that he two tones are interfering, hence the flutter (=3D sidebands both above and below the 100Hz tone). Cheers~ Christopher <div class=3D3= D"gmail_quote">On Mon, Aug 17=3D , 2009 at 2:41 PM, Ranjit Randhawa &amp= ;lt;<a href=3D3D"mailto:=3D rsran@xxxxxxxx">rsran@xxxxxxxx</a>&gt;= wrote: <blockquote c=3D lass=3D3D"gmail_quote" style=3D3D"border-left: 1px solid rgb= (204, 204, 204); ma=3D rgin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Dear List, I have been experimenting with a 100hz tone, where the positive half sinuso=3D id of the period is larger than the negative, the phase is however is not c=3D hanged. Speech seems to have this profile of larger positive pulses as comp=3D ared to the negative, hence my interest. Applying fft to such a signal, I g=3D et an increase in magnitude for the 100hz component, and an increase in the=3D dc component. What I hear however is the basic 100hz tone, and a flutter o=3D n top of it, not what fft seems to indicate. My assumption was that the inc=3D reased dc component would not be heard, and I would hear an increase in lou=3D dness of the 100 hz. However, the base 100hz loudness does not seem to chan=3D ge as I increase the area under the positive sinusoid, but the flutter does=3D . Any history or explanation would be most welcome. Thanks and regards, Randy Randhawa </blockquote></div> -- <a href=3D3D"http://www.c=3D j.lovelyweather.com">www.cj.lovelyweather.com</a> &l= t;a href=3D3D"mailto:chri=3D stopherjette@xxxxxxxx">christopherjette@xxxxxxxx</a><br&= gt;617.869.3968<b r> --00504502c070c4ec3104716d3ad4-- ------------------------------ Date: Tue, 18 Aug 2009 15:28:59 -0500 From: Tao Zhang <<a href=3D"mailto:Tao_Zhang@xxxxxxxx">Tao_Zhang@xxxxxxxx= TARKEY.COM</a>> Subject: DSP Research Engineer Position Available --_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_ Content-Type: text/plain; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable Starkey Laboratories, Inc., an equal opportunity employer and a recognized =3D world leader in providing the highest quality hearing technology available, has an exciting opportunity for a full-time DSP resea=3D rch engineer at its international headquarters located in Minnesota, USA. This position is responsible for research and development o=3D f signal processing algorithms for hearing aids. Qualifications A Ph.D. degree or equivalent in electrical engineering, computer science<BR= > or=3D related field is required. Candidates with a Master's degree in electrical engineering, computer science or related field and 3+ =3D years of applicable experience may be considered. Research experience in hearing aids or cochlear implants is highly desirable. Resear=3D ch experience in audio signal processing algorithms, psychoacoustics or acoustics is a plus. Skills * Proficiency in Matlab is required * Proficiency in C, C++ or C# is required * Good verbal and written communication skills are required * Good interpersonal skills are required * Advanced knowledge of digital signal processing is required * Technical leadership in a research project is highly desirable * Proficiency in statistical analysis is desirable * Familiarity with typical hearing aid algorithms, such as multiple-chan=3D nel compression, speech enhancement, microphone array processing, learning algorithms and audio classification algorithms i=3D s a plus Salary Salary will be commensurate with experience. Benefits Visa Sponsorship, 401k, Employee Stock Ownership Plan, Profit Sharing, Heal=3D th Insurance, and Tuition Reimbursement Contact Potential candidates should send a cover letter and a CV to Mr. Tony Tran u=3D sing the following information Tony Tran Human Resources Starkey Laboratories, Inc. 6600 Washington Ave. S. Eden Prairie, MN 55344 Tel: (952)828-6924 Email: tony_tran@xxxxxxxx<mailto:tony_tran@xxxxxxxx&gt= ; Web: <a href=3D"http://www.starkey.com/careers<http://www.st= arkey.com/careers>" target=3D"_blank">www.starkey.com/careers<http://= www.starkey.com/careers></a> --_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_ Content-Type: text/html; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D3D"urn:schemas-microsoft-com:vml" xmlns:o=3D3D"urn:schemas-micr=3D osoft-com:office:office" xmlns:w=3D3D"urn:schemas-microsoft-com:office:word" =3D xmlns:m=3D3D"http://schemas.microsoft.com/office/2004/12/omml"<BR= > xmlns=3D3D"http:=3D //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D3DContent-Type content=3D3D"text/html; charset=3D3Dus-ascii"> <meta name=3D3DGenerator content=3D3D"Microsoft Word 12 (filtered m= edium)"> <style>  </style>  </head> <body lang=3D3DEN-US link=3D3Dblue vlink=3D3Dpurple> <div class=3D3DSection1> Starkey Labora= tories, In=3D c., an equal opportunity employer and a recognized world leader in providing the highest quality hearing <o:p></o:p> technology ava= ilable, ha=3D s an exciting opportunity for a full-time DSP research engineer at its internati=3D onal headquarters located in <o:p></o:p> Minnesota, USA= . This pos=3D ition is responsible for research and development of signal processing algorithms<BR= > fo=3D r hearing aids. <o:p></o:p> style=3D3D'text-autospace:none'><o:p>&nbsp;</o:p&g= t;=3D style=3D3D'text-autospace:none'>Qualifications<o:p></= =3D o:p> A Ph.D. degree= or equiva=3D lent in electrical engineering, computer science or related field is required. Candidates with a Master&#8217;s <o:p></o:p> degree in elec= trical engineering, computer science or related field and 3+ years of applicable experience may be considered. Research <o:p></o:p><BR= > experience in = hearing ai=3D ds or cochlear implants is highly desirable. Research experience in audio signal processing algorithms, <o:p></o:p> psychoacoustic= s or acous=3D tics is a plus.<o:p></o:p> <o:p>&am= p;nbsp;</o:p> Skill= s <o:p></o:p></b=3D > <ul style=3D3D'margin-top:0in' type=3D3Ddisc> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Proficiency in Matlab is required<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Proficiency in C, C++ or C# is required<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Good verbal and written communication skills are required<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Good interpersonal skills are required<o:p></o:p></li><BR= > <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Advanced knowledge of digital signal processing is required<o:p></o:p&= gt;</li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Technical leadership in a research project is highly desirable<o:p></o:p></li> <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Proficiency in statistical analysis is desirable<o:p></o:p></li>= <li class=3D3DMsoNormal style=3D3D'mso-list:l0 level1 lfo1;text-autospace:none=3D '>Familiarity with typical hearing aid algorithms, such as multiple-channel compress=3D ion, speech enhancement, microphone <o:p></o:p></li> </ul> style=3D3D'margin-left:.5in;text-autospace:none'>array processing, learning algorithms and audio classification algorithms is a<BR= > pl=3D us<o:p></o:p> style=3D3D'text-autospace:none'><o:p>&nbsp;</o:p&g= t;=3D style=3D3D'text-autospace:none'>Salary<o:p></o:p>&l= t;/b>=3D Salary will be= commensur=3D ate with experience. <o:p></o:p> <o:p>&am= p;nbsp;</o:p> Benef= its <o:p></o=3D :p> Visa Sponsorsh= ip, 401k, =3D Employee Stock Ownership Plan, Profit Sharing, Health Insurance, and Tuition Reimbursement<o:p></o:p> <o:p>&nbsp;</o:p>= <span style=3D3D'font-size:12.0pt;font-family:"Tim=3D es New Roman","serif"'>Contact<o:p></o:p><= /span> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>Potential candidates should send a cover letter and a CV to Mr. Tony Tran using the following information<o:p></o:p> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&= amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=3D nbsp;&nbsp; Tony Tran<o:p></o:p> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&= amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=3D nbsp;&nbsp; Human Resources<o:p></o:p> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&= amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=3D nbsp;&nbsp; Starkey Laboratories, Inc.<o:p></o:p> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&= amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=3D nbsp;&nbsp; 6600 Washington Ave. S.<o:p></o:p> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&= amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=3D nbsp;&nbsp; Eden Prairie, MN 55344<o:p></o:p> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&= amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=3D nbsp;&nbsp; Tel: (952)828-6924<o:p></o:p> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&= amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=3D nbsp;&nbsp; Email: <a href=3D3D"mailto:tony_tran@xxxxxxxx">tony_tran@xxxxxxxx&= lt;/a><o:p></o: =3D p> <span style=3D3D'font-size:12.0pt;font-family:"Times =3D New Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&= amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=3D nbsp;&nbsp; Web: <a href=3D3D"http://www.starkey.com/careers">www.starkey.com/care= ers</a><o:p> =3D </o:p> <span style=3D3D'font-size:11.0pt;font-family:"Calibri",=3D "sans-serif"; color:#1F497D'><o:p>&nbsp;</o:p><= BR> </div> </body> </html> --_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_-- ------------------------------ End of AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187) *************************************************************** =20 <hr width=3D"100%"> The information in this email is confidential. 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